american. >> reporter: in addition to paul ryan, marco rubio appeared in that same washington event. both are thinking about a possible run for the presidency in 2016. rubio said republicans also have to reshape their message to middle class americans and those who want to enter the middle class. >> major garrett, thank you. >>> officials say another crisis is looming, but it's physical not fiscal. flu season is off to an early and strong start. the south is already hard hit by this year's strain. three school systems in tennessee have closed the rest of the week because so many students and teachers are sick. with us now, past president of the national foundation for infectious diseases. doctor, good morning. >> good morning. >> it's early, it's serious and it's caused by a virus that causes more serious illness. so it's not too late to get vaccinated. vaccine is our best prevention of influenza. we want to prevent pneumonia, hospitalization and, of course, deaths. >> how effective do you think this year's vaccine is? >> at the moment we know from analyzing the viruses we've alread